(;GM[1]FF[4]SZ[19]
GN[Efficiency (1)]
PC[http://senseis.xmp.net/?TheEmptyTriangleIsBad]AP[GoWiki:2009]
DT[2018-06-28]
C[Diagram from http://senseis.xmp.net/?TheEmptyTriangleIsBad

Efficiency (1)]
PL[W]

AB[ig][jh][ik][jk][jl]
CR[jk]


;CR[jk]
)
